Runtime Code Uncompressed in F000 Shadow RAM

Intel Desktop Board D925XCV/D925XBC Technical Product Specification

Table 51. Runtime Code Uncompressed in F000 Shadow RAM

Code	Description of POST Operation

03	NMI is Disabled. To check soft reset/power-on.

05	BIOS stack set. Going to disable cache if any.

06	POST code to be uncompressed.

07	CPU init and CPU data area init to be done.

08	CMOS checksum calculation to be done next.

0B	Any initialization before keyboard BAT to be done next.

0C	KB controller I/B free. To issue the BAT command to keyboard controller.

0E	Any initialization after KB controller BAT to be done next.

0F	Keyboard command byte to be written.

10	Going to issue Pin-23,24 blocking/unblocking command.

11	Going to check pressing of <INS>, <END> key during power-on.

12	To init CMOS if "Init CMOS in every boot" is set or <END> key is pressed. Going to disable DMA
	and Interrupt controllers.

13	Video display is disabled and port-B is initialized. Chipset init about to begin.

14	8254 timer test about to start.

19	About to start memory refresh test.

1A	Memory Refresh line is toggling. Going to check 15 µs ON/OFF time.

23	To read 8042 input port and disable Megakey GreenPC feature. Make BIOS code segment
	writeable.

24	To do any setup before Int vector init.

25	Interrupt vector initialization to begin. To clear password if necessary.

27	Any initialization before setting video mode to be done.

28	Going for monochrome mode and color mode setting.

2A	Different buses init (system, static, output devices) to start if present. (See Section 4.3 for details
	of different buses.)

2B	To give control for any setup required before optional video ROM check.

2C	To look for optional video ROM and give control.

2D	To give control to do any processing after video ROM returns control.

2E	If EGA/VGA not found then do display memory R/W test.

2F	EGA/VGA not found. Display memory R/W test about to begin.

30	Display memory R/W test passed. About to look for the retrace checking.

31	Display memory R/W test or retrace checking failed. To do alternate Display memory R/W test.

32	Alternate Display memory R/W test passed. To look for the alternate display retrace checking.

34	Video display checking over. Display mode to be set next.

37	Display mode set. Going to display the power-on message.

38	Different buses init (input, IPL, general devices) to start if present. (See Section 4.3 for details of
	different buses.)

39	Display different buses initialization error messages. (See Section 4.3 for details of different
	buses.)

3A	New cursor position read and saved. To display the Hit <DEL> message.

continued

106

D925XBC, D925XCV specifications

The Intel D925XBC and D925XCV are motherboards designed for Intel's LGA 775 socket, targeted primarily at the desktop market during the mid-2000s. These motherboards support Intel's innovative 800 MHz Front Side Bus and provide a robust platform for various computing applications, including gaming and multitasking.

One of the standout features of the D925XBC and D925XCV is their compatibility with Intel's Pentium 4 and Pentium D dual-core processors. These processors deliver impressive performance, especially for users engaging in demanding tasks such as video editing and 3D rendering. The support for dual-channel DDR2 memory allows for increased bandwidth and improved overall system performance, accommodating up to 8 GB of memory in total.

The motherboards are equipped with the Intel 925X chipset, which integrates advanced technologies. This chipset supports Intel's Enhanced Memory 64 Technology (EM64T), allowing for more efficient processing power and better resource management. The presence of the I/O Controller Hub (ICH6) also enhances connectivity options, including SATA 3.0 Gbps interfaces for faster data transfer rates and improved storage capabilities.

Regarding expansion and connectivity, both motherboards feature multiple PCI Express slots along with PCI slots, allowing users to customize their systems according to their needs. This expandability is essential for gamers and professionals looking to add advanced graphics cards and other peripherals. Additionally, these boards come with integrated audio, ensuring satisfactory sound quality without the need for additional sound cards.

The D925XBC and D925XCV motherboards also include integrated Ethernet controllers, supporting fast network connectivity essential for gaming and high-speed internet access. With multiple USB ports available, users can connect a wide variety of devices easily, enhancing the flexibility of their setups.

In terms of form factor, both boards follow the ATX layout, providing compatibility with a broad range of computer cases. This ensures ease of installation and upgrades while promoting good airflow and optimal thermal management for the components installed.

Overall, the Intel D925XBC and D925XCV motherboards integrate essential features and technologies that provide a solid foundation for desktop computing during their time. With strong processing capabilities, expandability, and good connectivity options, these boards were well-received by users looking for reliable performance and versatility in their systems.